Viewing archive of Saturday, 16 May 2015

Daily bulletin on solar and geomagnetic activity from the SIDC

Issued: 2015 May 16 1230 UTC

SIDC Forecast

Solar flares

Eruptive (C-class flares expected, probability >=50%)

Geomagnetism

Quiet (A<20 and K<4)

Solar protons

Quiet

	10cm flux	Ap
16 May 2015	132	007
17 May 2015	127	016
18 May 2015	122	021

Bulletin

NOAA 2339 and 2342 produced a C2 class flare each. No other flaring events were observed. A large filament in the northeast quadrant erupted shortly before midnight. No obvious x-ray signature was associated with this event. No earth-directed coronal mass ejections (CMEs) have been observed.

Further C-class flaring is expected, with a slight chance on an M-class flare.

Solar wind speed declined further from 530 km/s to its current value of about 430 km/s. Bz varied between -4 and +2 nT. Quiet to unsettled geomagnetic conditions were observed. A recurrent positive polarity coronal hole (CH) has completed its central meridian transit.

The arrival of the 13 May CME and the high speed stream from the aforementioned CH are expected for late 17 or 18 May. This may result in active conditions, with a minor storming episode not excluded. Until then, quiet to unsettled geomagnetic conditions are expected.

Today's estimated international sunspot number (ISN): 069, based on 07 stations.

Solar indices for 15 May 2015

Wolf number Catania	///
10cm solar flux	137
AK Chambon La Forêt	011
AK Wingst	008
Estimated Ap	009
Estimated international sunspot number	089 - Based on 26 stations

Noticeable events summary

Provided by the Solar Influences Data analysis Center© - SIDC - Processed by SpaceWeatherLive

All times in UTC

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